I'n my opinion Flowerhorns are by far some of the best fish to breed, I've seen some Flowerhorns go for thousands of dollars. The main reason a Flowerhorn can grab a high price tag would be how big the KOK (nuchal hump) is on the males.
Another cichlid that goes for a good price would be the Red Texas Cichlid, which is a hybrid cross between a Male Green Texas cichlid, and a Female Blood Red Parrot cichlid.
Now as for LFS giving a fair price for the fish you bring into them is really nonexistent because they normally try to low ball you on the price. Whereas a LFS here in the Denver, CO. area actually gives you 50% of what they would resale the fish for.